问题
解答题
已知
|
答案
∵
-1 a
=3,1 b
∴
=3,即a-b=-3ab,b-a ab
∴原式=(a-b)-3ab 2(a-b)+ab
=(-3ab)-3ab 2(-3ab)+ab
=-6ab 5ab
=-
.6 5
已知
|
∵
-1 a
=3,1 b
∴
=3,即a-b=-3ab,b-a ab
∴原式=(a-b)-3ab 2(a-b)+ab
=(-3ab)-3ab 2(-3ab)+ab
=-6ab 5ab
=-
.6 5